With the advent of the widespread use of the Internet, however, the situation has changed. Consumers whose information sensitivity is high (i.e., among leading-edge consumers) now use the Internet to search for information even for low-involvement products. The consumers’ decision-making process depends therefore on their information sensitivity, not on the involvement level of the products. Also, these leading-edge consumers become in effect another type of media as they broaden their experience through the Internet. Under these circumstances, research about leading-edge consumers and the introduction of a new CDM is highly significant. This book gathers data about leading-edge consumers, analyzes these data, then proposes a new type of CDM called “circulation marketing”. Following this model, not only the previous types of CDM, but also the new kind of CDM, including share behavior of leading-edge consumers, is explained.